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2419404 - Disclosure - Fair Value - Fair Value Measurements on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail)
(http://www.capitalbank-us.com/role/FairValueFairValueMeasurementsOnRecurringBasisUsingSignificantUnobservableInputsLevel3Detail)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001479750 (http://www.sec.gov/CIK)
Fair Value, Hierarchy [Axis]Significant Unobservable Inputs (Level 3)
Measurement Frequency [Axis]Fair Value on Recurring Basis
Major Types of Debt and Equity Securities [Axis]Industrial revenue bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
 
 
Beginning balance
3,437,000  
3,690,000  
Principal reduction
(170,000) 
(170,000) 
Included in other comprehensive income
31,000  
(83,000) 
Ending balance
3,298,000  
 
3,437,000